Supergirl (CW, 8:00 p.m.) — The long-awaited mega crossover event begins tonight. In case you missed the news, the CW decided to give TV geeks everywhere a big nerd boner by uniting Supergirl, the Flash, Arrow and the Legends for a battle against a superheroes’ worst enemy: aliens. Tonight, Barry and Cisco enlist Kara’s help with a pesky alien invasion. Meanwhile, Eliza comes to town to celebrate Thanksgiving with her daughters and Alex thinks the holiday is the perfect time to come out to her mother and Kara teams up with Lena Luthor to combat a deadly virus unleashed by CADMUS.
CMA Country Christmas (ABC, 8:00 p.m.) — It’s been about four days since we all survived Thanksgiving with our Trump supporting family members (pretty much everyone has at least one of those) and already ABC is shoving another holiday down our throats. First up, the 2016 Christmas concert special featuring performances by Idina Menzel; Andra Day; Amy Grant; Brad Paisley; Brett Eldredge; Chris Young; Kelly Clarkson; and Sarah McLachlan.
Gotham (Fox, 8:00 p.m.) — As the virus continues to spread through Gotham and the city’s sole lab working on a cure becomes compromised, Gordon deals with an even bigger problem: his feud with Mario which reaches a breaking point right before the wedding.
The Voice (NBC, 8:00 p.m.) — We’re down to the Top 10.
WWE Monday Night Raw (USA, 8:00 p.m.) — Charlotte and tag-team champs The New Day defend their titles.
American Dad! (TBS, 8:30 p.m.) — An intimate body part of Francine’s becomes an art piece in a fancy museum.
People of Earth (TBS, 9:00 p.m.) — Jeff becomes friends with a stranger online; Ozzie takes Father Doug out on the town; and Gina hosts a coming-out event for StarCrossed members.
Jane the Virgin (CW, 9:00 p.m.) — Jane’s cousin is sticking around and she’s starting to get on the family’s nerves. Meanwhile, Jane lands in hot water with Rafael after taking Mateo to church despite his dad’s objections and Rogelio seeks help from a matchmaker.
Lucifer (Fox, 9:00 p.m.) — Maze questions Amenadiel’s loyalty after he appears to align with Charlotte while Charlotte tries to turn Chloe against Lucifer as part of her plan to get him to leave Earth.
The Odd Couple (CBS, 9:30 p.m.) — Oscar and Felix finally seek advice from a therapist after their meddling and unwanted opinions begin to disrupt their friends’ lives.
Martha & Snoop’s Potluck Dinner Party (VH1, 10:00 p.m.) — Robin Thicke, Keke Palmer and DJ Khaled join Martha and Snoop for breakfast for dinner.
Conviction (ABC, 10:00 p.m.) — The team takes on the case of a man convicted of kidnapping a girl ten years ago. The only problem: the kidnapped girl just escaped her real captor’s home.
Timeless (NBC, 10:00 p.m.) — Flynn travels back to thwart the historic Apollo 11 mission forcing the team to summon their courage and reach out to an unsung hero for help.
LATE NIGHT GUESTS
The Tonight Show Starring Jimmy Fallon: Ice-T, Alexis Bledel, David Gray
The Daily Show With Trevor Noah: Ryan Speedo Green
Conan: Joel McHale, Kate Mara, Alice Wetterlund